Abstract
The adsorption kinetics of CO 2 on amine-functionalized mesoporous silica at low concentrations was investigated. Experimental data of CO 2 uptake as a function of time at temperatures between 25 and 70 °C were fit to a series of kinetic models, namely Lagergen's pseudo-first and pseudo-second order and Avrami's kinetic models. The best fit was obtained using Avrami's model, as it provided a fractional reaction order (ca. 1.4), which has been associated with the occurrence of multiple adsorption pathways. In addition, simulations of CO 2 adsorption in a column packed with amine-grafted mesoporous silica using computational fluid dynamics were carried out to predict breakthrough curves. The simulation results were compared to experimental data produced at various flow rates of a stream containing 5% CO 2 balance nitrogen. In all cases, the predicted breakthrough time and the corresponding CO 2 uptake were in close agreement with the experimental data.
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